341
Writing to TCNT
15 8 7 0
Address: H'5FFFFB8 H'5A Write data
Writing to TCSR
15 8 7 0
Address: H'5FFFFB8 H'A5 Write data
Figure 12.2 Writing to TCNT and TCSR
Writing to RSTCSR: RSTCSR must be written by a word access to address H'5FFFFFBA. It
cannot be written by byte transfer instructions. Procedures for writing 0 in WOVF (bit 7) and for
writing to RSTE (bit 6) and RSTS (bit 5) are different, as shown in figure 12.3. To write 0 in the
WOVF bit, the write data must be H'A5 in the upper byte and H'00 in the lower byte. This clears
the WOVF bit to 0. The RSTE and RSTS bits are not affected. To write to the RSTE and RSTS
bits, the upper byte must be H'5A and the lower byte must be the write data. The values of bits 6
and 5 of the lower byte are transferred to the RSTE and RSTS bits, respectively. The WOVF bit is
not affected.
Writing 0 to the WOVF bit
15 8 7 0
Address: H'5FFFFBA H'A5 H'00
Writing to the RSTE and RSTS bits
15 8 7 0
Address: H'5FFFFBA H'5A Write data
Figure 12.3 Writing to RSTCSR
Reading from TCNT, TCSR, and RSTCSR: TCNT, TCSR, and RSTCSR are read like other
registers. Use byte transfer instructions. The read addresses are H'5FFFFB8 for TCSR,
H'5FFFFB9 for TCNT, and H'5FFFFBB for RSTCSR.
To Next Page
Loading...
